package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.JwtClaimsConstant;
import com.sky.constant.MessageConstant;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.JwtProperties;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.JwtUtil;
import com.sky.vo.UserLoginVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.net.URL;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private JwtProperties jwtProperties;
    //微信服务接口地址
    public static final String URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Override
    public UserLoginVO login(String code) {
        //去服务器校验code获取openID
       Map<String,String>map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String response = HttpClientUtil.doGet(URL, map);
        //把获取到的字符串形式的openID转换成JSON格式
        JSONObject jsonObject = JSON.parseObject(response);
        String openid = jsonObject.getString("openid");
        //判断是否获取到openid
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否为新用户
      User user = userMapper.getUserByOpenId(openid);
        if (user == null){
             user = new User();
             user.setOpenid(openid);
             user.setCreateTime(LocalDateTime.now());
             userMapper.insert(user);//插入数据,回写主键
        }
        //创建token
        Map<String, Object> claims = new HashMap<>();
        claims.put(JwtClaimsConstant.USER_ID,user.getId());
        String token = JwtUtil.createJWT(jwtProperties.getUserSecretKey(), jwtProperties.getUserTtl(), claims);
        //封装VO
        UserLoginVO userLoginVO = UserLoginVO.builder()
                .id(user.getId())
                .openid(user.getOpenid())
                .token(token)
                .build();
        return userLoginVO;
    }
}
